Setting label malloc in MAC development_ error_ Break breakpoint (Xcode)

From: http://stackoverflow.com/questions/971249/how-to-find-the-cause-of-a-malloc-double-free-error

To add a symbolic breakpoint . . .

    In the bottom-left corner of the breakpoint navigator, click the Add button. Choose Add Symbolic Breakpoint. Enter the symbol name in the Symbol field. Click Done.

It is mainly used to solve the problem of releasing the same object multiple times.

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